Sindarin verbs work differently, yet similarly to Quenya
verbs. Unlike Quenya which uses the same general pronoun endings for
everything including verbs, Sindarin tends to use independent pronouns for all
purposes except with verbs. Verbs have their own special pronoun endings,
appended to the end of the proper verb tense. The ONLY time an
independent pronoun would be used with a verb (and even then it is along with
the properly-suffixed verb, not instead of) is when it is being emphasized, such
as when saying "I will run, not you" (Im nerithon, ú-le).

Being verbs (conjugated like regular A-verbs; see there
for proper pronoun endings)

stem "be": na-

to be: na

be! (imperative): no!

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PRESENT-TENSE BEING VERBS ARE NOT GENERALLY USED IN PURE SINDARIN, seemingly
only when paired with lone adverbs (which must by rule follow a verb not a noun)
or when especially emphasizing (ex. "You are beautiful").

am/are/is: ná

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The following are used more widely, when dealing in past or future tenses.
Remember these are only valid with nouns and adjectives; for verbs let
the specific conjugations do the work.